THANKS!! To Lew Graham of Christchurch NZ for suppling the following BSA Service Sheet No.710x.
“Frame repairs, all models”. The drawings required scanning and the dimensions enlarged for those of us over 40 so this might take some time to finish but I have made a start.
1954 SWING ARM A GROUP, B GROUP AND
GOLDSTAR
M20,M21 AND M33 RIDGED FRAME
1945-1948
M20,M21 AND M33 RIDGID FRAME
1949 ONWARDS